my advice to you mate is sit back and soak up all the info you can about the conversion then decide what your going to do reaserch and developement is key my friend and phils advice is good advice, also take into acount everything you,ll need to run this 300 bhp ive been pissing about with rst,s over ten years now and its easy to get overwelmed by bills for this and that apearing unexpectedly because you didnt know this or that, ask all the questions you want mate till your satisfied your clued up enough to seperate the shit from the good then do it
ive got a silver top like phil mentioned with steel rods ect, for 300 you,ll need steel rods budget a thousand for rods and pistons then the machineing to the block manifolds turbo then management also cooler a std 16v head and cams will give you your 300 so no need to mess thier
good luck fella and welcome to pf